EP0973960B1 - Procede pour produire des pieces en mousse moulee - Google Patents

Procede pour produire des pieces en mousse moulee Download PDF

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Publication number
EP0973960B1
EP0973960B1 EP98912489A EP98912489A EP0973960B1 EP 0973960 B1 EP0973960 B1 EP 0973960B1 EP 98912489 A EP98912489 A EP 98912489A EP 98912489 A EP98912489 A EP 98912489A EP 0973960 B1 EP0973960 B1 EP 0973960B1
Authority
EP
European Patent Office
Prior art keywords
mold
potential
coating
moulding die
foam article
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98912489A
Other languages
German (de)
English (en)
Other versions
EP0973960A1 (fr
Inventor
Heinz-Günter UNGEHEUER
Paul Hennel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daimler AG
Original Assignee
DaimlerChrysler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Priority to EP01113491A priority Critical patent/EP1154045A1/fr
Publication of EP0973960A1 publication Critical patent/EP0973960A1/fr
Application granted granted Critical
Publication of EP0973960B1 publication Critical patent/EP0973960B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/003—Electroplating using gases, e.g. pressure influence
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/54—Electroplating of non-metallic surfaces
    • C25D5/56—Electroplating of non-metallic surfaces of plastics
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/615—Microstructure of the layers, e.g. mixed structure
    • C25D5/617—Crystalline layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/627—Electroplating characterised by the visual appearance of the layers, e.g. colour, brightness or mat appearance

Definitions

  • the invention relates to a method for producing a molded foam part according to claim 1.
  • Molded foam parts adhere to the molds in which they are manufactured be, whereby the removal of the molded foam parts is made very difficult or impossible.
  • Another way to improve the separation behavior consists of the components to form the foam part add internal release agent.
  • Such an approach is described for example in DE-C-38 37 351.
  • a further illustration of this procedure can be found also in "Internal release agents for polyurethane systems", P. Horn, H.-U. Schmidt and G. Ramlow, plastics consultants 10/1987, pp. 24-26.
  • a release agent can also be used be applied to the surface of the mold. This The procedure is described, for example, in DE-A-1 131 873, where in the manufacture of polyurethane foam bodies substances reacting with isocyanate groups in excess be applied to the mold. Also in DE-C-38 27 595 it is stated that to improve the demolding properties the inner walls of the mold used, if necessary known external mold release agents applied / coated become.
  • the object of the invention is a method for producing a To provide molded foam part, where none Release agents are required.
  • the shaping surfaces are used as a non-stick coating of the mold with a chromium-based electroplating wherein means for generating a stream of an ionized Gases or gas mixtures and means for introducing and blowing of the gas or gas mixture is provided in the mold are.
  • the electroplating layer of chrome VI with traces of chromium III, ferrite and zinc is preferably between 40 microns and 0.1 mm.
  • the Electroplating can advantageously on a chemical Transition layer made of nickel with a copper content of 1 to 15% are applied, the thickness of the transition layer can be between 35 and 55 microns.
  • An advantageous development of the method according to the invention for the production of a mold provides that Plastic molds first an electrically conductive Carrier layer is applied.
  • FIG. 1 and 2 is a closed (Fig. 1) or a open (Fig. 2) mold 1 before.
  • An air treatment unit 2 for generating ionized gas, here ionized air, is connected to the molding tool 1 via a blowing probe 3, so that ionized air and possibly via the blowing probe 3 dielectric can also be passed into the mold 1 can.
  • the positive pole of a high-voltage unit 4 is shown in Fig. 1 with the inner region of the mold 1, in Fig. 2 with the End of the blowing probe 3 connected.
  • the negative pole of the high voltage unit 4 is grounded, the mold 1 also has in each case via an earth 5.
  • vents 6 are additionally provided.
  • the coating according to the invention is made from metallic materials applied as follows:
  • the molding tool then becomes chemical or electrochemical acted upon or - especially with high silicon content of the mold - machined.
  • a chemical transition layer is made of nickel applied with a copper content of 0 to 15% in an acid immersion bath.
  • the thickness of the chemical transition layer is preferably approx. 35 to 55 ⁇ m.
  • a galvanic layer is applied to the transition layer, which can also be called a chemical load layer, in an acid bath, for example a 2% sulfuric acid bath applied.
  • the galvanic layer is preferably made of chromium VI with traces of chromium III, ferrite with approx. 0.5% and zinc. she has a total thickness of approx. 40 ⁇ m-0.1 mm. For example, it can consist of three sub-layers, initially a base layer of approx. 30 ⁇ m whirled up with a weak current density becomes.
  • a base layer of approx. 5 to 50 ⁇ is placed on this base layer m thickness applied, with a higher current density than at the base layer is worked, but the rate of crystallization by moving the anode faster is checked.
  • the current, voltage, DC and electrolyte quality analog hard chrome plating must be calculated as standardized. Subsequently any residual crystals that may be present are ground by grinding removed and the mold can be assembled become. It has a high surface hardness of approx. 1200 Vickers achieved, which achieves a practically unlimited lifespan is.
  • the procedure is the same, but will be started here the molding tool has an electrically conductive carrier layer applied, which consist for example of epoxy paint or metallic paint can and have a thickness of, for example, 0.2 mm can.
  • an electrically conductive carrier layer applied consist for example of epoxy paint or metallic paint can and have a thickness of, for example, 0.2 mm can.
  • the coating is characterized by a very dense crystal structure on the surface out.
  • the molecules of the foam along the surfaces of the mold so excited that it does not affect the crystal structure of the coating can penetrate. This suggestion must persist for so long remain until all possible chemical reactions are completed during the foaming process.
  • By different pH values and different water contents of the energy is dissipated in various foaming systems. cause this degradation is the vibrating polyurethane molecules on the nest wall during the course of the chemical Process for curing the polyurethane. This in the mold gradually degraded during chemical reactions Energy must be constantly replaced for trouble-free foaming become.
  • the original potential of the coating in the mold cavity is not necessarily after the first foaming, but mostly reduced. This decrease is an energy loss.
  • the foamed part When the foamed part is removed from the mold, it is formed along the Mold coating a negative e-potential. This e-potential in turn, the one introduced during partial removal transfer kinetic energy to the outer skin of the foam part.
  • the foam part surface is immediately after the separation positively charged from the mold cavity coating and parallel by further removing the coating its e-potential built up negatively.
  • the foam part is a contains certain electrical charge; however, would be with release agent this charge even bigger (flying sparks).
  • V (r) the vector layer in the mold cavity
  • Vx ⁇ u ⁇ x
  • Vy ⁇ u ⁇ y
  • Vz ⁇ x ⁇ z ⁇ U (r) potential for V (r)
  • Vdr (degree U)
  • the first option is to pickle the galvanic layer and then galvanize again, but what with involves a great deal of effort.
  • the goal is to restore Emax.
  • the galvanic layer can be mechanically joined a rotating disc and lubricant are rubbed, whereby for example, a rotating disc made of textile or fur is used becomes (by kinetic energy E1 potential to E-max built up).
  • the frequency of friction depends on the strength of the energy degradation described above. This option requires Although only a small amount of material is used difficult to automate and therefore requires personnel.
  • the surface of the Mold using ionized gases or gas mixtures especially to reenergize ionized air.
  • Ionized air can be generated in a high voltage system, taking air for example in a 50 kV high voltage system when flowing through positively charged and heated to approx. 30 to 90 ° C becomes.
  • the air treated in this way is approx. 4 to 6 bar upstream of the Foaming applied to the mold or on its surface.
  • dielectric e.g. on vegetable-based, such as paraffin oil or castor oil or silicone oil
  • This procedure is complete and easy to automate, brings low energy consumption with itself and leads to an easy partial removal.
  • the only disadvantage is that installation in the foaming system is required.
  • the ionized gas or here the ionized air, are each depending on the shape size in the tool for approx. 3 to 30 seconds blown in, which must be done after every third shot.
  • the fourth option is to use the dielectric directly into the A component of the foam system, e.g. into the A component of a polyurethane system as part of the recipe interfere. Due to the admixture limited to a maximum of 8% is the energy reduction through the prevented charge exchange reduced or broken off between the mold and the foam part surface and Ez increased. For trouble-free operation the charge exchange can be prevented by 90 to 95%.
  • the application is very light, but low pH values decrease and high water content in the foam systems improve the efficiency the dielectric agent. The physical values of the molded foam part can get worse.
  • the above invention is particularly suitable for use in the production of molded polyurethane parts with all previously known foam systems such as RIM, integral, soft or Foam components.
  • Reactive used everywhere Media combine homogeneously with a touch surface want (e.g. chipboard production etc.) can do the invention can also be used.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Claims (4)

  1. Procédé de production d'une pièce en mousse moulée dans un outil de moulage, dans lequel on emploie un outil de moulage dont les surfaces donnant la forme de la pièce présentent un revêtement anti-adhérence sous forme d'une couche galvanique, caractérisé par les pas de procédé suivants :
    on produit un flux d'un gaz ou d'un mélange de gaz ionisé et on le souffle dans l'outil de moulage ;
    on exécute dans l'outil de moulage le processus de réaction conduisant à la pièce en mousse moulée ;
    on démoule la pièce en mousse moulée finie.
  2. Procédé selon la revendication 1, caractérisé par le fait que comme mélange de gaz ionisé on emploie de l'air chargé positivement à une température d'environ 30 à 90°C que l'on souffle dans l'outil de moulage sous une pression d'environ 4 à 6 bars.
  3. Procédé selon la revendication 1 ou 2, caractérisé par le fait que pour faciliter l'échange de charge on enrichit avec un diélectrique le gaz ou le mélange de gaz.
  4. Procédé selon la revendication 1 ou 2, caractérisé par le fait que pour faciliter l'échange de charge on enrichit avec un diélectrique les composants prévus pour la formation de la pièce en mousse moulée.
EP98912489A 1997-04-02 1998-03-19 Procede pour produire des pieces en mousse moulee Expired - Lifetime EP0973960B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01113491A EP1154045A1 (fr) 1997-04-02 1998-03-19 Procédé de fabrication d'un moule dont les surfaces de formage sont couvertes d'un revêtement anti-adhérent sous forme d'une couche galvanique à base de chromium

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19713566 1997-04-02
DE19713566A DE19713566C2 (de) 1997-04-02 1997-04-02 Verfahren zum Herstellen eines Formwerkzeugs, Vorrichtung zum Schäumen von Formschaumteilen sowie Verfahren zum Herstellen eines Formwerkzeugs
PCT/EP1998/001602 WO1998044171A1 (fr) 1997-04-02 1998-03-19 Dispositif pour produire des pieces en mousse moulee, procede permettant de produire un outil de moulage et procede permettant de produire une piece en mousse moulee

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP01113491A Division EP1154045A1 (fr) 1997-04-02 1998-03-19 Procédé de fabrication d'un moule dont les surfaces de formage sont couvertes d'un revêtement anti-adhérent sous forme d'une couche galvanique à base de chromium

Publications (2)

Publication Number Publication Date
EP0973960A1 EP0973960A1 (fr) 2000-01-26
EP0973960B1 true EP0973960B1 (fr) 2002-07-24

Family

ID=7825206

Family Applications (2)

Application Number Title Priority Date Filing Date
EP98912489A Expired - Lifetime EP0973960B1 (fr) 1997-04-02 1998-03-19 Procede pour produire des pieces en mousse moulee
EP01113491A Withdrawn EP1154045A1 (fr) 1997-04-02 1998-03-19 Procédé de fabrication d'un moule dont les surfaces de formage sont couvertes d'un revêtement anti-adhérent sous forme d'une couche galvanique à base de chromium

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP01113491A Withdrawn EP1154045A1 (fr) 1997-04-02 1998-03-19 Procédé de fabrication d'un moule dont les surfaces de formage sont couvertes d'un revêtement anti-adhérent sous forme d'une couche galvanique à base de chromium

Country Status (6)

Country Link
EP (2) EP0973960B1 (fr)
KR (1) KR20010005968A (fr)
CN (1) CN1251623A (fr)
CA (1) CA2285303A1 (fr)
DE (2) DE19713566C2 (fr)
WO (1) WO1998044171A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009005609B3 (de) * 2009-01-21 2010-07-01 Bayer Materialscience Ag Werkzeug und Verfahren zur Herstellung von Mehrschicht-Kunststoffformteilen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10337559A1 (de) * 2003-08-14 2005-03-10 Stankiewicz Gmbh Formwerkzeug zur Herstellung von Formschaumkörpern
US20140210121A1 (en) * 2011-08-15 2014-07-31 Johson Controls Technology Company Semi Permanent Tool Coating Enhancement for Extended Number of Releases

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1131873B (de) * 1956-07-10 1962-06-20 Helmut Loewer Verfahren zum Herstellen von Polyurethan-Schaumstoffkoerpern in mit Trennmitteln versehenen Werkzeugen
FR2067635A5 (fr) * 1969-11-12 1971-08-20 Peugeot & Renault
JPS6244410A (ja) * 1985-08-23 1987-02-26 Hitachi Tokyo Electron Co Ltd レジン屑除去方法および装置
DE3827595A1 (de) * 1988-08-13 1990-02-22 Bayer Ag Verfahren zur herstellung von urethangruppen ausweisenden polyharnstoff-elastomeren
JP2701946B2 (ja) * 1988-12-07 1998-01-21 ザ・グッドイヤー・タイヤ・アンド・ラバー・カンパニー ゴムタイヤの成型方法
FR2698888B1 (fr) * 1992-12-07 1995-02-10 Centre Techn Ind Mecanique Procédé de chromage de pièces de frottement.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009005609B3 (de) * 2009-01-21 2010-07-01 Bayer Materialscience Ag Werkzeug und Verfahren zur Herstellung von Mehrschicht-Kunststoffformteilen
WO2010083959A1 (fr) 2009-01-21 2010-07-29 Bayer Materialscience Ag Moule et procédé de production d'articles moulés en plastique multicouche

Also Published As

Publication number Publication date
DE19713566A1 (de) 1998-10-08
WO1998044171A1 (fr) 1998-10-08
DE19713566C2 (de) 1999-11-18
KR20010005968A (ko) 2001-01-15
CA2285303A1 (fr) 1998-10-08
EP1154045A1 (fr) 2001-11-14
CN1251623A (zh) 2000-04-26
EP0973960A1 (fr) 2000-01-26
DE59804895D1 (de) 2002-08-29

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